For instance, Vermeer's Girl Reading a Letter at an Open Window was first subjected to X-ray analysis in 1979 and revealed the image of a Cupid lurking under the overpainting. X-ray imaging can reveal anything that has been painted over a canvas or where the artist may have altered his (or her) original vision.
X-rays are a well-established tool to help analyze and restore valuable paintings because the rays' higher frequency means they pass right through paintings without harming them. These discoveries were made with a portable macro-X-ray fluorescence (MA-XRF) imaging device that enabled the researchers to analyze the paintings on site, with no need for taking physical samples. In one, there is a ghostly third hand partially hidden under a white overprinted layer the other has adjustments to the crown and other royal items in a portrait of Ramesses II. Researchers have discovered evidence of earlier versions of two ancient Egyptian paintings located in tomb chapels in the Theban Necropolis, according to a new paper published in the journal PLoS ONE. Martinez et al./CC-BY 4.0 reader comments 12 with
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